1-Meteors and Meteorites
At night, when the sky is clear and the moon is not there, we may sometimes see bright streaks of light in the sky. These are commonly known as
shooting stars, although they are not
stars. They are called meteors. A meteor
is usually a small object that
occasionally enters the earth’s
atmosphere. At that time it has a very
high speed. The friction due to the
atmosphere heats it up. It glows and
evaporates quickly. That is why the
bright steak lasts for a very short time.
Some meteors are large and so they
can reach the Earth before they
evaporate completely. The body that
reaches the Earth is called a meteorite.
Meteorites help scientists in
investigating the nature of the material
from which the solar system was formed.
2-Sometimes Venus appears in the eastern sky before sunrise. Sometimes it appears in the western sky just after sunset. Therefore it is often called a morning or an evening star, although it is not a star.